The Stanford Reasearch SIM925 is an eight input channel, four-wire multiplexer for low-level signal applications. Kelvin-lead measurements are supported with optional buffering of the two sense leads. The buffer can be switched out to form a simple relay-based, 4-pole/8-throw switch. Multiple modules may be cascaded allowing unlimited networking possibilities. The digital control circuitry in the SIM925 is designed with a special clock-stopping architecture in which the microcontroller is turned on only when switch settings are being changed. This guarantees that no digital noise contaminates low-level analog signals. Settings may be changed from the front panel or through the remote interface. The multiplexer settings can also be queried. If armed, the module generates a status signal to alert the user of an overload condition. The SIM925 can be operated outside the SIM mainframe by powering it with its required DC voltages.